A Digital-Signal-Processor (DSP) Flux-Locked-Loop (FLL) for LTC SQUIDs with Automatic Reset and Feedback Cancellation

摘要: Linear operation of SQUID sensors is normally provided by a flux-locked-loop, FLL, which provide negative feedback mode [1]. In the signals are amplified, phase sensitively detected, filtered, integrated, and resulting analog signal provides measure magnetic field noise in output. The Output fed back as flux to modulation coil through voltage-current Converter oppose applied field. from FLL proportional change then ability track changes within well defined linear range slew rate or dynamic system not exceeded.